Materials Literature
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The analytic solutions are given for three simple axisymmetric systems involving toroidal conductors and iron. The solutions can be used for testing and gauging the accuracy of three-dimensional numerical schemes. In each case it is demonstrated how the fields can be calculated from a spherical harmonic expansion. Thi…
2-Pyrrolidinone, the lactam of gamma-aminobutyric acid (GABA), is identified as the major constituent of total GABA in human CSF. Structural elucidation was done by mass spectrometry. In lumbar CSF of four patients, 2-pyrrolidinone represented about 54% of GABA found after acid hydrolysis, thus accounting for essentia…
This study was designed to collect and characterize aerosols released during metal cutting activities typically used in decommissioning radioactively contaminated facilities. Such information can guide in the selection of appropriate control technologies for these airborne materials. Mechanical cutting tools evaluated…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicellar control of organic reactions: propellane substrates as stereochemical probes for micellar bindingAnand Natrajan, Joseph D. Ferrara, Wiley J. Youngs, and Chaim N. SukenikCite this: J. Am. Chem. Soc. 1987, 109, 24, 7477–7483Publication Date (Print):November 1, 1987Pub…
Abstract The permeability coefficients for He, O 2 , N 2 , CH 4 , and CO 2 in miscible blends of polystyrene (PS) and tetramethyl bisphenol‐A polycarbonate (TMPC) at 35°C and 1 atm driving pressure are reported. Sorption isotherms for CO 2 and CH 4 are also presented. The isotherms were fitted to the dual sorption mod…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochromic and fluorescent probe studies in glassy polymer matrices. 2. Isomerizable planar probe molecules lacking an inversion center of symmetryJohn G. Victor and John M. TorkelsonCite this: Macromolecules 1987, 20, 11, 2951–2954Publication Date (Print):November 1, 1987…
Abstract Fourier‐transform infrared spectroscopy (FTIR) shows that during the curing of PMR‐15 polyimide, formation of an anhydride intermediate occurs prior to the formation of polyamic acid, suggesting that its origin is the diester diacid starting material, as has recently been proposed by Johnston and coworkers. T…
The structure of pentagonal Frank-Kasper phases can be recovered from the projection of a common MgCu2 cube described in a six-dimensional space. From the close structural relationship between the newly discovered icosahedral quasicrystal and the Frank-Kasper phases, a structure model has been proposed for the former.
Accelerated electrochemical techniques were used to study the corrosion of carbon steel in laboratory-simulated aqueous environments representing typical produced waters from natural gas production wells. Specifically, the separate and conjoint effects of the various ionic species in the electrolyte, and the influence…
Monte Carlo simulation is used to study the elastic properties of the classical hard-sphere solid. The elastic constants ${C}_{11}$, ${C}_{12}$, and ${C}_{44}$ are computed for the fcc lattice structure at the melting density. Poisson's ratio is computed and is shown to be positive. These ``exact'' results are compare…
Abstract From the Part I experiments, n -butyl-EAB shows a strong interaction (chemisorption) with the carbon black surface. The chemical structure of chemisorbed n -butyl-EAB is similar to that of the component, with a peak at 290 nm. The EAB groups of the chain-ends in the modified polymer enhance the adsorption of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrown thioether chemistry of iron(II/III). Synthesis and characterization of low-spin bis(1,4,7-trithiacyclononane)iron(III) and crystal structure of [FeII([9]aneS3)([9]aneS3(O))](ClO4)2.2NaClO4.H2OHeinz Josef Kueppers, Karl Wieghardt, Bernhard Nuber, Johannes Weiss Weiss, E…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDual emissions from (2,9-dimethyl-1,10-phenanthroline)bis(tertiary phosphine)copper(1+) systems in a rigid glass: influence of the phosphine donor strengthDominick J. Casadonte Jr. and David R. McMillinCite this: Inorg. Chem. 1987, 26, 23, 3950–3952Publication Date (Print):N…
Cobalt(I1) 4,4'4″4‴-tetrasulfophthalocyanine, Co^(II)TSP, covalently linked to the surface of titanium dioxide particles, TiO_2-CoTSP, is shown to be an effective photocatalyst for the oxidation of sulfur(IV) to sulfur(VI) in aqueous suspensions. Upon band-gap illumination of the semiconductor, TiO_2, conduction-band…
Experimental techniques for the deposition and sintering of ceramic particle films on a rigid substrate have been investigated. Three representative systems (SiO 2 , ZnO‐Bi 2 O 3 , and Al 2 O 3 ) were chosen to determine the validity of the conceptual processing model. Crack‐free, sintered films 1 to 50 μm thick were…
A comparative study of three related families of ferroelectric liquid crystals and some distinctly different analogues has been made with the aim of clarifying systematic trends in smectic C phase stability and the appearance of macroscopic polarization. The substances are interesting not only because the C phases are…
This review outlines the advances that have been made in experimental data reduction and analysis techniques which can be used to characterise the crystallization kinetics and crystal size distributions in batch crystallizers. A process description based on batch conservation equations describing population, mass and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCooperative relaxations in condensed macromolecular systems. 2. Computer simulation of self-diffusion of linear chainsT. Pakula and S. GeylerCite this: Macromolecules 1987, 20, 11, 2909–2914Publication Date (Print):November 1, 1987Publication History Published online1 May 20…
The electrochemical response of Al alloys containing various concentrations of Mo in solid solution was studied using potentiodynamic polarization. The evolution of the chemical composition of the passive film during exposure to deaerated was analyzed using x‐ray photoelectron spectroscopy. Exposure of Al‐Mo alloys to…
It is shown that the penetration plots of the grain-boundary diffusion of 65Zn in polycrystalline Al samples are curved at fixed temperatures and that this upward curvature changes with the annealing time. The penetration profiles can be interpreted in terms of sub-boundary diffusion characterized by the parameter P 1…